Airlocks

See also: obscured loading

Like elevators, these are convenient level/map change locations if visibility is limited in terms of environment outside of the airlock.

Commonly seen as part of research facilities, medical facilities (for highly contagious diseases), spacecraft, space stations, submarines and other watercraft, some military bases (for screening and containing any intruders), and so forth.

This tag is usable regardless if the airlock is actually air tight or anything, as long as it serves a similar function.